What is a bill? Like in Congress or whatever

Explanation:

a bill is a proposed legislation under consideration by a legislature.

A bill can be introduced in either chamber of Congress by a senator or representative who sponsors it. Once a bill is introduced, it is assigned to a committee whose members will research, discuss, and make changes to the bill. The bill is then put before that chamber to be voted on

Explanation:

so something very vital in the law making process

the answer is d.index